A：患佝偻病
B：引起贫血
C：产生龋齿
D：甲状腺肿大
已知∠1与∠2互余，∠2与∠3互补，∠1=67°，则∠3=____
— The driver couldn’t see the road clearly because of the heavy rain. This is the main reason.
They____in the door.
下列地理现象，与太阳活动密切相关的是（ ）
